DC112d/DC112
User’s manual
41
CRITERIA FOR ACCEPTANCE AND REJECTION
A) ABSOLUTE ACOUSTIC SENSITIVITY
The reading, in reference conditions, must be 94,0 dB ± 1,0 dB.
B) FREQUENCY WEIGHTING
The indication should vary according to the following table:
FRECUENCY
(Hz)
A WEIGHTING
(dB)
TOLERANCE
(dB)
63,10 - 26,2
± 2,0
125,9 - 16,1
± 1,5
251,2 - 8,6
± 1,5
501,2 - 3,2
± 1,5
1000 0,0
± 1,5
1995 + 1,2
± 2,0
3981 + 1,0
± 3,0
7943 - 1,1
± 5,0
C) LINEARITY
The maximum linearity error is ± 1,0 dB.
D) RESPONSE TO SHORT DURATION SIGNALS
The indication should vary according to the following table:
FACTOR
∆L
(dB)
TOLERANCE WITH
REFERENCE SIGNAL OF
94 dB
(dB)
TOLERANCE WITH
REFERENCE SIGNAL OF
140 dB
(dB)
1/100 - 20
± 1,0 ± 1,5
1/1000 - 30
± 1,0 ± 1,5
E) RESPONSE TO UNIPOLAR PULSES
The difference between the indication with positive-going pulses and the indication with
negative-going pulses must be no more than ± 1,0 dB.
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